import java.util.Scanner;


public class Atividade13 {
	public static void main (String arg[]){
	double vetor[]= new double[10];
	Scanner digitar = new Scanner(System.in);
			for (int i=0;i<10;i++){
				vetor[i]=digitar.nextDouble();
			}
			for (int i=1;i<10;i=i+2){
				System.out.println(vetor[i]);
			}
	}

}
